Sensor network system and data transfer method for sensing data

a sensor network and data transfer technology, applied in the field of information use, can solve the problems of server processing bottlenecks, search engine not suitable for efficient retrieval of real-time information, etc., and achieve the effects of reducing data processing load, preventing excessive load of directory server and network, and reducing the load of data processing

Active Publication Date: 2006-10-26
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] Thus, according to this invention, as the data can be transferred to the home server even when the mobile sensor node moves to another distributed server in the sensor network, it is possible to manage the sensing data in a unified manner. As the directory server does not need to directly manage the data and the position information of the mobile sensor node, it is possible to reduce a data processing load even when the number of mobile sensor nodes increases.
[0010] Each mobile sensor node does not nee...

Problems solved by technology

However, there is a problem in that the search engine is not suitable for efficient retrieval of real-time information from a great amount of sensor information connected to the network, or to detection of change in infor...

Method used

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  • Sensor network system and data transfer method for sensing data

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Experimental program
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second embodiment

[0287] FIGS. 38 to 46 show a second embodiment where actions are executed in a distributed data processing server DDS. An action executer ACE is installed in the event-action controller EAC of the distributed data processing server DDS shown in FIG. 9, and the event table ETB of FIG. 10 is replaced by an event action table EATB for defining event generation and action execution. Other components are similar to those of the first embodiment. According to the second embodiment, a distributed data processing server DDS that becomes an external server directly transfers measured data of an external sensor node to a home server DDS.

[0288] In FIG. 38, the event-action controller EAC of the distributed data processing server DDS includes an event-action table EATB for correlating measured data collected from base stations BST to event actions through a network processor NWP.

[0289] The event-action controller EAC includes an action executer ACE for executing actions set in the event-actio...

third embodiment

[0329] FIGS. 47 to 49 show a third embodiment where a node search server NSS for holding information of a mobile sensor node is installed in addition to the directory server DRS and the distributed data processing server DDS of the second embodiment, and an internal node (home node) monitor agent NMA for monitoring an internal sensor node is added to the distributed data processing server DDS.

[0330] Referring to FIG. 47, an example of an overall operation will be described. A wireless mobile sensor node MSN-1 that is an internal sensor node of a distributed data processing server DDS-1 as a home server moves from a base station BST-1 under the home server to a base station BST-n under another distributed data processing server DDS-2 (external server).

[0331] Upon detection of a new external sensor node (MSN-1) from the base station BST-n, the external server transfers data of this wireless mobile sensor node MSN-1 as external (foreign) sensor node data FND to the node search server...

fourth embodiment

[0341]FIGS. 50 and 51 show a fourth embodiment of a processing procedure of transmitting a command (instruction) from the operation terminal ADT to the mobile sensor node in the first to third embodiments.

[0342] As shown in FIG. 3, a wireless mobile sensor node MSN as a mobile sensor node includes a power supply unit POW such as a battery, therefore it is important to manage a charge amount (residual power amount) of the power supply unit POW. As shown in FIG. 4, a period of a sleep state must be adjusted as it can operate intermittently. Accordingly, a system administrator must send a command from the operation terminal ADT to the mobile sensor node (MSN-1) to check a state or to change settings of the mobile sensor node.

[0343] In this case, unlike fixed sensor nodes, the mobile sensor node is not always near its home server. Thus, the manager cannot easily know which one of distributed data processing servers DDS-1 to n the mobile sensor node exists. For example, as shown in FIG...

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Abstract

To suppress a server processing load and a network load in a sensor network which accommodates a great number of mobile sensor nodes. Among a plurality of distributed data processing servers (DDS) for managing data of sensor nodes, a distributed data processing server (DDS) that is a home server to hold data of a mobile sensor node is set for each sensor node by a directory server (DRS). At each distributed data processing server (DDS), upon reception of the data from the sensor node, identification process is executed as to whether the data is sensor data to be managed by itself or another distributed data processing server. If a result of the identification is the sensor data to be managed by another distributed data processing server, the data is transferred to the distributed data processing server (DDS-1), which corresponds to the home server of the sensor data, based on setting of the directory server (DRS).

Description

CLAIM OF PRIORITY [0001] The present application claims priority from Japanese application P2005-85638 filed on Mar. 24, 2005, the content of which is hereby incorporated by reference into this application. BACKGROUND OF THE INVENTION [0002] This invention relates to a technique for use of information from many sensors connected to a network. [0003] Networks including the Internet have been recently used mainly for access to accumulated contents including documents, images, videos, or voices, the access being made through search engines, preset links, or the like. In other words, a technique for accessing stored contents has been established. [0004] To transmit real-time information, a streaming technology is known for continuously distributing images of a camera (WEB camera) installed in a predetermined position. Development has been recently made on a sensor network technology to obtain sensing data acquired from a great number of compact wireless sensor nodes through a network (e...

Claims

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Application Information

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IPC IPC(8): G06F15/173
CPCH04L67/12H04W84/18
Inventor MORIWAKI, NORIHIKO
Owner HITACHI LTD
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